Hi Dan, good to hear from you, the message seems to be a warning only and should be fine.
If PaCER fails, maybe check whether patients that worked well on Mac fail or if it’s a problem of a novel patient. So far didn’t have OS-specific reports on Pacer functionality. If problem persists, maybe shoot Andreas Husch an Email or ask again in the Slack channel (see Help on our website) where Andreas is also active.
The community on Slack is much more active, maybe better to get help there in general :)